Has anyone come across this issue? This is the cabin compression strut at the back of the mast just below the deck. Looks like it had been moved once before. Fine threads may help but there is vey little aluminum to bite into. I'll look for some sort of expanding aluminum anchor or even a strap/bail system through-bolted if needed. Suggestions??
To get some more "meat" for the bolt an aluminum blind rivet nut would be the easiest solution.
Durk Nijdam
S/V "SILER"
Catalina 36MKII - 2001 / hullnr. 2013
Stavoren - Holland
Looks like two new holes had already been previously drilled and re-tapped? My turnbuckle tends to loosen up during the season. Not sure if there is a an order for tightening the turnbuckle? Before shrouds are connected? Before sails are on? I have had to tighten mine up mid season the past two seasons (since owning her).
Mike
Jackfish Girl, 1999, C36 MKII, Tall Rig, Wing Keel, In-mast furling, Monument Beach, Bourne, MA
Mike Shea; After looking at the metal around the holes in the mast, it appears that force was applied in an outward direction from the inside mast to the outside. This begets the question; Are you tightening this turn buckle ? As I understand it, the design of this turn buckle is to apply pressure in an outward direction from the mast to the underside of the deck, thus preventing 'oil canning' of the deck. It is the outward expansion of this turn buckle that supports the deck. Looks like the fix would be the next size in screws using the same holes. At least that was my understanding.
Hoping Les will chime in here.......Bill
Bill Dolan 1990 Catalina C-36 MKI - Hull #1041 'Williwaw'
Std. Rig, Walk Through, Wing Keel
M35, Oberdorfer Conversion,
Home Waters; Charlotte Harbor & The Gulf Islands of Florida
'You are never out of work if you own a boat'
I was told during our survey that the purpose of this turnbuckle is to prevent "oil canning" of the cabin roof from wave pressure on the hull. It should only be torqued so it is just snug when the boat is at the dock. It looks like someone torqued way beyond snug here.
Paul & Wendy Keyser
"First Light"
Rye NH
2005 C36 MKII #2257
Wing, M35B
The function I suspect is to hold the cabin top down as the shroud/bukhead load is trying to squeeze the boat and pull the bulkheads throught the deck (oil canning?). The bottom screw would take all the tension while the top would see compression and shear. The previous holes indicate that as well. I bought these rivet nuts which should do the trick (Thanks for the suggestion Siler Starum!).
I have never adjusted the turnbuckle but have always notcied it's not loose. The last sail was about 3 hours of just under 30 knots on the nose on our way to Catalina which would put stress on this joint.
beware of serious galvanic corrosion when using stainless rivet-nuts!!!
Durk Nijdam
S/V "SILER"
Catalina 36MKII - 2001 / hullnr. 2013
Stavoren - Holland
Put a couple of rivnuts in there. You can set them using several washers a nut and bolt. No need for a special tool.
Les & Trish Troyer
Mahalo
Everett, WA
1983 C-36 Hull #0094
C-36 MK 1 Technical Editor.
Commodore